Knife



Aug. 21, 1923.

R. L. WRlGHT KNIFE Fiied May 9, 1922 /M l .w m

Patented Aug. 21, 1923.

ROBERT LLOYD WRIGHT, OF SALEM, OHIO.

KNIFE.

Application filed May 9,

To all whom z'tmay concern:

Be it known that I, ROBERT L. WRIGHT, a citizen of the United States,and resident of Salem, county of Columbiana, and State of Ohio, haveinvented a new and useful -Improvement in Knives, of which the followingis a specification.

My invention relates to knives having disappearing and renewable knifeblades.

One of the objects of my invention is a knife having a renewable bladewhich can easily be inserted into or removed from the handle; anotherobject is a means, directly on the knife, for sharpening the bladewithout grinding; another object is a knife in which used razor bladescan be utilized for knife purposes; another object is a knlfe in whichthe blade can easily be brought into or outv of operative position:another object is a knife in which the blade is protected to preventinjury to its cutting edge as well as to the operator: another objectisa knife into which a blade can be clamped without tools; other objectswill appear or become apparent in the description of this invention.

I attain these objects by the mechanism shown, in one exemplification,in the accompanying drawing in which Fig. 1 is a general side view of acomplete knife made according to the present invention, partly brokenaway to show location and arrangementof elements thereof; Fig. 2 is anend view of Fig. 1 at 2, on a larger scale; Fig. 3 is a section on line3-3 of Fig. 1,- also on a larger scale; Fig. at is a section on line 4-4of Fig. 1, also on a larger scale; Fig. 5 is a section on line 5-5 ofFig. 1. also on a larger scale; Fig. 6 is an end view of Fig. 1 at 6,also on a larger scale: Fig. 7 is a perspective view of the sheath; Fig.8 is a perspective view of the blade holder shell: Fig. 9 is aperspective view of the blade holder spacer; Fig. 10 is a perspectiveview of the blade clamp, and Fig. 11 is a general perspective viewshowing method of breaking of? the ends of the blades.

Similar reference characters refer to similar parts throughout theviews.

In many instances it is necessary that a very sharp and pointed knifeblade be available. For instance. for ripping seams in households. or intailor shops. for cutting cloth intailor shops or elsewhere, for cuttingpaper in various industries as in pack- 1922. Serial NO. 559,504.

which can readily be sharpened by anopera'.

tor not skilled in sharpening knives.

Referring now particularly to the draw- I 1 ing.

drawn brass although other material may be used, is formed as shownperspectively in Fig. 7 and sectionally in Figs. 3, 4, and 5, andfurther in Figs. 2 and 6.

The blade holder B is, preferably, made of hard drawn brass althoughother material may be used, and is formed as shown perspectively in Fig.8 and seotionally in Figs. 3, 4, and 5.

The outside of this blade holder B fits stiflly into the inside of thehollow 10 of the sheath A and is formed with the slot 11 extending allthe way through both the wider portion 12 and the narrower portion 13.Both walls of the portion 13 are reduced in thickness at 14 and theseportions 14 are provided with the hinge pin hole 15. Thel: purpose forthe above will appear present v.

The spacer C, preferably made of brass, is formed as shown perspectivelyin Fig. 9 and sectionally in Figs. 3, 4;, and 5, and has the widerportion 16, the handle portion 17, the narrow portion 18, and theprojecting portion 19. This spacer fits into the slot 11 of the holder Band is secured therein by spot welding or other means.

The clamp D is formed as shown in Fig. 10. of somewhat springy ortenacious material, preferably brass. and has the hinge pin hole 20 andthe slot 21 which fits over the reduced ends 14: and is hinged theretoby the hinge pin 22.

The thickness and width of the ends 14 should be reduced sufliciently sothat the outside of the clamp D is flush with the outside of the portion13 for the purpose of permitting the holder B to slide endwise freelyinside of the sheath A when the holder is assembled with the spacer Cand the clamp D in position.

The clamp D is first formed with the slot 21 somewhat narrower than thewidth The sheath A, preferably made of hard I over both of the ends 14so that the clamp forces these ends 14 inward or together and therebyclamp them upon the blade E when the clamp is in normal position as seenn Fig. 1 and thereby holds the blade E 1n position in the holder.

The blade E, either a used razor blade or one made for the purposes ofthe present knife, fits into the slot 11 and over the projection 19 andextends outwardly therefrom.

The spacer C does not extend to the full rear end of the holder B, thusleaving the end portion of the slot 11 open a short distance inward atthis rear end.

This open slot provides a means for resharpening the blades which;sharpening is accomplished by inserting the dull end of the blade E intothis slot and breaking off the dull portion which action presents a newcutting edge at the front end or point where the resent knife is mostlyused.

T e spacer C does not extend to the full front end of of the holder B,thus leaving the slot 11 open at the ends 14 for the purpose ofinserting the blade E.

The ends 14 on the holder B are also cut away on the top at 23 of adepth equal to the thickness of the metal of the clamp D so that the topthereof is flush with the top of the holder B to permit the holder toslide freely inside of the sheath A.

The sheath A is first formed with the lower edges 24 and 25 touchingeach other. The portions 26 and 27 are then cut away, thus forming theslot 28 wherein the portion 16 of the spacer C can slide freely.

At each end of the slot 28, the portions 24 and 25 act as stops toarrest the forward and the backward movement of the holder B durin thenormal manipulations thereof.

After the parts are made up as set forth, the knife as a whole isassembled as follows:

Place the spacer G into the holder B in proper position and secure itthere. Then place the clamp D in position and insert and secure thehinge pin 22. Then swing the clamp to out of the way position orreleasing position on the pin 22 as indicated by dotted lines in Fig. 1whereupon the ends 14 spring outward slightly, thus releasing the ends14 and increasing the width of the slot 11. It is noted that the clamp Dis not quite as wide as the portion 13, thus providing the shoulder 29against which pressure may be exerted, by finger nail or I otherwise, topush the clamp, which fits tightly over the ends 14 when in normalposition, out of the way. Then insert the lads E into the slot 11 andover the projection 19 and then push the clamp D down and over the ends14 which operation clamps the blade into position.

Then insert and push the now assembled holder and blade longitudinallyinto the slot 10 at the rear end of the sheath A until the shoulder 30strikes the lower and rear ends 24 and 25. Then exert sufficientpressure, also longitudinally, to force these ends 24 and 25 apartsufficiently to permit the holder to enter. Then push the holderfurther, in the same direction, until the neck of the handle 17 residesin the slot 28 where it can move back and forth freely. l

The operation of the appearing and disappearing feature of this knife isas follows:

After the holder with the blade is inserted and the knife is completelyassembled, the holder is pushed backwards by means of the handle 17until the rear end thereof strikes the normally touching ends 24 and 25which acts as a stop and indicates that the blade is in receded positionwithin the sheath A Where the cutting edge of the knife as well as theuser thereof is protected from injury.

When it is desired to use the knife, push the holder forward by means ofthe handle 17 until the front end thereof strikes the normally touchingends 24 and 25 which acts as a stop forwardly and indicates that theblade is fully extended outside of the sheath A where it is availablefor cutting purposes.

When it is desired to insert a new blade, the holder is pushedbackwards, by means of the handle 17, until it strikes the rear ends 24and 25; a further and more forceful push backwards opens these ends andpermits the holder to be removed from the sheath. A new blade is theninserted into the holder by means of the clamp D as previously setforth.

To prevent rusting of the knife, it is preferred that all parts exceptthe blade be made of nonferrous metal, brass for instance, and may benickeled or otherwise plated.

Modifications of the knife shown and described may be made within thescope of the appended claims.

Therefore, without limiting myself to the precise construction shown anddescribed,

I claim:

1. A knife comprising a hollow sheath, a blade holder slidably mountedin said sheath and provided with a slot at the front end, a blade havingone end thereof mounted in said slot, and a clamp over said front endand adapted to clamp said blade into operative position and to releasethe same for removal thereof.

2. A knife comprising a hollow sheath provided with a slot on one elgeintermeiate its ends a blade holder slidably mounted in said sheath andprovided with a slot at the front end and with a neck projecting throughsaid slot in said sheath and with a handle projectindg outside of saidslot in said sheath, stop e gas on each end of said slot in said sheathto prevent excessive backward and forward movement of said holder, ablade having one end thereof mounted in said slot, and a clamp over saidfront end and adapted to clamp said blade into operative position and torelease the same for removal thereof.

3. A knife blade holder having a slotted portion adapted to receive aknife blade and a second slotted portion adapted to engage a knife bladefor the purpose of breaking off the end thereof, a U shaped clamp overthe first said slotted portion and hinged thereto and adapted to closein or release the first said slotted ortion.

4. A kni e comprising a hollow sheath having a slot on one edgeintermediate its ends, a blade holder slidably mounted in said hollowsheath and provided with a blade holding means on its front end and witha neck extending through said slot and with a handle on said neck andprojecting outside of said sheath, a blade having the near end thereofmounted in said holding means, and a stop means to prevent excessivebackward and forward movement of said holder.

5. A knife comprising a hollow sheath having a slot on one ed and a stopat each end of this slot, a b ade holder slidably mounted in said sheathand provided with a blade holding means on its front end and withv aneck on its rear end projecting through said slot intermediate saidstops and with a handle on said neck and projecting outside of saidsheath, and a blade in sald blade holding means.

6. A knife comprising a hollow sheath having a slot on one edge and astop at each end of this slot, a blade holder slidably mounted in saidsheath andprovided with a sharpening slot at one end and with a secondslot on the other end, a blade in said second slot, and a U shaped clampover and hinged to the said other end of said holder.

7. A knife comprising a hollow sheath 0 en at each end and having a sloton one e ge and a sto at each end of this slot, a blade holder sli ablymounted in said sheath and adapted to be inserted into and removed fromsaid sheath through the rear one of said open ends and.provided with asharpening slot at one end and with a second slot on the other end, ablade in said second slot and adapted to slide in and out through thefront one of said open ends in the sheath, and a clamp over and hingedto the said other end of the holder.

In testimony whereof I have hereunto aflixed my si ature.

R0 ERT LLOYD WRIGHT.

